Also helpful tip... monitor your batteries closely. I got 1 of my batteries (that were married upon purchase) that are beginning to fail. Stops charging @ 3.3V and after testing it with a multi-meter, I can confirm that there is indeed a failure of one of the cells, that pair will be split, the bad battery removed and recycled properly, and the lone survivor may get repurposed for a flashlight.
Make sure you grab some clear tape, write the date of purchase and FIRST FULL CHARGE on the battery, then cover the writing with some clear tape. This battery set is approaching the 11 month mark. Which is impressive since I have so many batteries that have lasted less time than that.